Nice one, thanks!

...

Here's a great quote from another post:

http://fibereality.com/blog/more-400g-insanity-at-ecoc/

"There also seems to be a lack of appreciation for the impact of lower rate deployments, such as the record number of 1-gigs being deployed, and that 10-gig devices will be needed to incorporate them, and so there will be more opportunities for 4x10G going forward, which will continue to be used for growth in networks. On the other hand, there is also the matter of 25-gig servers only barely happening now because they have not been exactly a piece of cake to develop them – and so 50-gig servers cannot be expected to become real anytime soon, along with the optical devices at that speed. Therefore, an additional impact on delaying any kind of meaningful appearance of 400G will be noticed way down the road (because we just are not believers in 8x50G becoming a reality).

Most importantly, 100G will become the new currency in the same way as 10G over the last 20 years or so, as suppliers look to drive economies of scale, and the former may easily be leveraged even longer than the latter — with the lion’s share of the funding having been generated internally by those same vendors (as we noted in the past, the first time it has happened in the optical space). So, with a real opportunity to move down the cost curve on 100G, there will hardly be any rush to take on the R&D expenses of 200G on the client side, the likely interim step of 4x50G before any kind of substantial move to 400G."